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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
Walt Disney helped combat malaria by making an animated film in 1943 called The Winged Scourge. This short film starred the seven dwarfs and taught children that mosquitos transmit malaria, which is a very bad disease. It advocated the killing of mosquitos to stop the disease.
Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
Asthma cases in Americans are about 75% higher today than they were in 1980.
![The nurse needs to inform the patient with impaired vision when a touch is to occur and ask permissi](https://biology-forums.com/gallery/47/medium_2137_17_05_12_2_06_13.jpeg)
![Patients should be encouraged to bring to their health care visit all the substances that they take,](https://biology-forums.com/gallery/47/medium_2137_17_05_12_2_10_44.jpeg)